(exp)if you do a favor for somebody, you will get a return favor; if a fish is friendly toward water, water will be kind to the fish too; mutual back-scratching
(exp)if you do a favor for somebody, you will get a return favor; if a fish is friendly toward water, water will be kind to the fish too; you scratch my back and I'll scratch yours→Related words:
魚心あれば水心
(exp)if you do a favor for somebody, you will get a return favor; if the water is kind to fish, the fish will be friendly toward water too; mutual back-scratching→Related words:
魚心あれば水心
Japanese Dictionary
